The number in your query likely refers to one of two things:
Ardrey, however, took Dart’s findings and wove them into a powerful psychological theory he called the "Cain Complex." He suggested that the biblical story of Cain slaving Abel was a racial memory of our transition from prey to predator. According to Ardrey, we carry the guilt and the instinct of that ancient violence in our genes. african genesis robert ardrey pdf 23
However, be extremely cautious: Many of these PDFs are scanned from 1960s paperbacks and are either: The number in your query likely refers to